Get ready for a celestial spectacle that’s as fleeting as it is breathtaking: on November 12, Mars and Mercury will briefly grace the evening sky just after sunset, but you’ll need lightning-fast reflexes to catch them before they vanish. Here’s the catch: these two planets will be hugging the southwestern horizon, making them a challenge to spot even under perfect conditions. But here’s where it gets controversial—while most skywatchers focus on Mars’s iconic red glow, Mercury’s subtle brilliance often gets overlooked. Is one truly more worthy of our attention than the other? Let’s dive in.
At sunset on November 12, Mercury will hover about 5 degrees above the horizon, with Mars glowing just 1 degree to its upper right. To visualize this, hold your arm straight out and spread your three middle fingers—that’s roughly 5 degrees. Your little finger? That’s about 1 degree. And this is the part most people miss: by the next evening, Mercury will have darted to the right of Mars, continuing its westward sprint across the sky. This dynamic duo is so close to the sun this month that you must wait until the sun is fully below the horizon before aiming any optical tools their way—safety first! Check your local sunset times on TimeandDate (https://www.timeanddate.com/) to plan your viewing.
The past month has been a cosmic ballet, with Mercury tracing a zigzag path beneath Mars in our sky. This back-and-forth motion, known as retrograde, happens as Mercury overtakes Earth in its orbit, creating the illusion of moving east to west. Meanwhile, Mars marches steadily west to east—a phenomenon called prograde motion. But here’s the bold question: does retrograde motion challenge our understanding of planetary movement, or is it just a reminder of how much we still have to learn about our cosmic neighbors?
In the coming months, both planets will sink lower on the horizon as they approach their solar conjunctions—Mercury on November 20 and Mars in January 2026. These events mark their closest approach to the sun from our perspective on Earth. As they dip closer to the sun’s glare, spotting them will become even trickier, adding to the urgency of catching this November 12 alignment.
Editor’s Note: If you capture this rare planetary pairing through your lens, share your astrophotography with Space.com’s readers! Send your photos, along with your name, location, and any comments, to spacephotos@space.com. Let’s celebrate the beauty of the cosmos together.
Stay tuned for more breaking space news, rocket launch updates, skywatching events, and more! Anthony Wood, a passionate advocate for space exploration and the night sky, joined Space.com (http://space.com/) in April 2025 after writing for IGN, New Atlas, and Gizmodo. His enthusiasm for human spaceflight and the return to the moon is infectious—join him in looking up and wondering what’s next.
Final thought: As Mars and Mercury flirt with the horizon this November, ask yourself—what other cosmic secrets are waiting just beyond our sight? Share your thoughts in the comments below!
